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HID: bpf: Add Huion Dial 2 bpf fixup

Pretty much similar to the Inspiroy 2, but with 2 wheels and 8 buttons.

This bpf also works in both normal and vendor mode. If the device is
switched into vendor mode by huion-switcher, a udev property is set
which is then retrieved by this bpf object. This allows to hide the now
unused normal collections.

Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests/103
Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests/104
Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/merge_requests/111
Link: https://patch.msgid.link/20240627-import-bpf-v1-5-0dbcda4a5b1f@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

Benjamin Tissoires 9b52d811 f0374154

+615
+614
drivers/hid/bpf/progs/Huion__Dial-2.bpf.c
··· 1 + // SPDX-License-Identifier: GPL-2.0-only 2 + /* Copyright (c) 2024 Red Hat, Inc 3 + */ 4 + 5 + #include "vmlinux.h" 6 + #include "hid_bpf.h" 7 + #include "hid_bpf_helpers.h" 8 + #include "hid_report_helpers.h" 9 + #include <bpf/bpf_tracing.h> 10 + 11 + #define VID_HUION 0x256C 12 + #define PID_DIAL_2 0x0060 13 + 14 + 15 + HID_BPF_CONFIG( 16 + HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_HUION, PID_DIAL_2), 17 + ); 18 + 19 + /* Filled in by udev-hid-bpf */ 20 + char UDEV_PROP_HUION_FIRMWARE_ID[64]; 21 + 22 + /* The prefix of the firmware ID we expect for this device. The full firmware 23 + * string has a date suffix, e.g. HUION_T21j_221221 24 + */ 25 + char EXPECTED_FIRMWARE_ID[] = "HUION_T216_"; 26 + 27 + /* How this BPF program works: the tablet has two modes, firmware mode and 28 + * tablet mode. In firmware mode (out of the box) the tablet sends button events 29 + * and the dial as keyboard combinations. In tablet mode it uses a vendor specific 30 + * hid report to report everything instead. 31 + * Depending on the mode some hid reports are never sent and the corresponding 32 + * devices are mute. 33 + * 34 + * To switch the tablet use e.g. https://github.com/whot/huion-switcher 35 + * or one of the tools from the digimend project 36 + * 37 + * This BPF works for both modes. The huion-switcher tool sets the 38 + * HUION_FIRMWARE_ID udev property - if that is set then we disable the firmware 39 + * pad and pen reports (by making them vendor collections that are ignored). 40 + * If that property is not set we fix all hidraw nodes so the tablet works in 41 + * either mode though the drawback is that the device will show up twice if 42 + * you bind it to all event nodes 43 + * 44 + * Default report descriptor for the first exposed hidraw node: 45 + * 46 + * # HUION Huion Tablet_Q630M 47 + * # 0x06, 0x00, 0xff, // Usage Page (Vendor Defined Page 1) 0 48 + * # 0x09, 0x01, // Usage (Vendor Usage 1) 3 49 + * # 0xa1, 0x01, // Collection (Application) 5 50 + * # 0x85, 0x08, // Report ID (8) 7 51 + * # 0x75, 0x58, // Report Size (88) 9 52 + * # 0x95, 0x01, // Report Count (1) 11 53 + * # 0x09, 0x01, // Usage (Vendor Usage 1) 13 54 + * # 0x81, 0x02, // Input (Data,Var,Abs) 15 55 + * # 0xc0, // End Collection 17 56 + * R: 18 06 00 ff 09 01 a1 01 85 08 75 58 95 01 09 01 81 02 c0 57 + * 58 + * This rdesc does nothing until the tablet is switched to raw mode, see 59 + * https://github.com/whot/huion-switcher 60 + * 61 + * 62 + * Second hidraw node is the Pen. This one sends events until the tablet is 63 + * switched to raw mode, then it's mute. 64 + * 65 + * # Report descriptor length: 93 bytes 66 + * # HUION Huion Tablet_Q630M 67 + * # 0x05, 0x0d, // Usage Page (Digitizers) 0 68 + * # 0x09, 0x02, // Usage (Pen) 2 69 + * # 0xa1, 0x01, // Collection (Application) 4 70 + * # 0x85, 0x0a, // Report ID (10) 6 71 + * # 0x09, 0x20, // Usage (Stylus) 8 72 + * # 0xa1, 0x01, // Collection (Application) 10 73 + * # 0x09, 0x42, // Usage (Tip Switch) 12 74 + * # 0x09, 0x44, // Usage (Barrel Switch) 14 75 + * # 0x09, 0x45, // Usage (Eraser) 16 76 + * # 0x09, 0x3c, // Usage (Invert) 18 77 + * # 0x15, 0x00, // Logical Minimum (0) 20 78 + * # 0x25, 0x01, // Logical Maximum (1) 22 79 + * # 0x75, 0x01, // Report Size (1) 24 80 + * # 0x95, 0x06, // Report Count (6) 26 81 + * # 0x81, 0x02, // Input (Data,Var,Abs) 28 82 + * # 0x09, 0x32, // Usage (In Range) 30 83 + * # 0x75, 0x01, // Report Size (1) 32 84 + * # 0x95, 0x01, // Report Count (1) 34 85 + * # 0x81, 0x02, // Input (Data,Var,Abs) 36 86 + * # 0x81, 0x03, // Input (Cnst,Var,Abs) 38 87 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 40 88 + * # 0x09, 0x30, // Usage (X) 42 89 + * # 0x09, 0x31, // Usage (Y) 44 90 + * # 0x55, 0x0d, // Unit Exponent (-3) 46 91 + * # 0x65, 0x33, // Unit (EnglishLinear: in³) 48 92 + * # 0x26, 0xff, 0x7f, // Logical Maximum (32767) 50 93 + * # 0x35, 0x00, // Physical Minimum (0) 53 94 + * # 0x46, 0x00, 0x08, // Physical Maximum (2048) 55 95 + * # 0x75, 0x10, // Report Size (16) 58 96 + * # 0x95, 0x02, // Report Count (2) 60 97 + * # 0x81, 0x02, // Input (Data,Var,Abs) 62 98 + * # 0x05, 0x0d, // Usage Page (Digitizers) 64 99 + * # 0x09, 0x30, // Usage (Tip Pressure) 66 100 + * # 0x26, 0xff, 0x1f, // Logical Maximum (8191) 68 101 + * # 0x75, 0x10, // Report Size (16) 71 102 + * # 0x95, 0x01, // Report Count (1) 73 103 + * # 0x81, 0x02, // Input (Data,Var,Abs) 75 104 + * # 0x09, 0x3d, // Usage (X Tilt) 77 105 + * # 0x09, 0x3e, // Usage (Y Tilt) 79 106 + * # 0x15, 0x81, // Logical Minimum (-127) 81 107 + * # 0x25, 0x7f, // Logical Maximum (127) 83 108 + * # 0x75, 0x08, // Report Size (8) 85 109 + * # 0x95, 0x02, // Report Count (2) 87 110 + * # 0x81, 0x02, // Input (Data,Var,Abs) 89 111 + * # 0xc0, // End Collection 91 112 + * # 0xc0, // End Collection 92 113 + * R: 93 05 0d 09 02 a1 01 85 0a 09 20 a1 01 09 42 09 44 09 45 09 3c 15 00 25 01 75 01 95 06 81 02 09 32 75 01 95 01 81 02 81 03 05 01 09 30 09 31 55 0d 65 33 26 ff 7f 35 00 46 00 08 75 10 95 02 81 02 05 0d 09 30 26 ff 1f 75 10 95 01 81 02 09 3d 09 3e 15 81 25 7f 75 08 95 02 81 02 c0 c0 114 + * 115 + * Third hidraw node is the pad which sends a combination of keyboard shortcuts until 116 + * the tablet is switched to raw mode, then it's mute: 117 + * 118 + * # Report descriptor length: 148 bytes 119 + * # HUION Huion Tablet_Q630M 120 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 0 121 + * # 0x09, 0x0e, // Usage (System Multi-Axis Controller) 2 122 + * # 0xa1, 0x01, // Collection (Application) 4 123 + * # 0x85, 0x11, // Report ID (17) 6 124 + * # 0x05, 0x0d, // Usage Page (Digitizers) 8 125 + * # 0x09, 0x21, // Usage (Puck) 10 126 + * # 0xa1, 0x02, // Collection (Logical) 12 127 + * # 0x15, 0x00, // Logical Minimum (0) 14 128 + * # 0x25, 0x01, // Logical Maximum (1) 16 129 + * # 0x75, 0x01, // Report Size (1) 18 130 + * # 0x95, 0x01, // Report Count (1) 20 131 + * # 0xa1, 0x00, // Collection (Physical) 22 132 + * # 0x05, 0x09, // Usage Page (Button) 24 133 + * # 0x09, 0x01, // Usage (Vendor Usage 0x01) 26 134 + * # 0x81, 0x02, // Input (Data,Var,Abs) 28 135 + * # 0x05, 0x0d, // Usage Page (Digitizers) 30 136 + * # 0x09, 0x33, // Usage (Touch) 32 137 + * # 0x81, 0x02, // Input (Data,Var,Abs) 34 138 + * # 0x95, 0x06, // Report Count (6) 36 139 + * # 0x81, 0x03, // Input (Cnst,Var,Abs) 38 140 + * # 0xa1, 0x02, // Collection (Logical) 40 141 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 42 142 + * # 0x09, 0x37, // Usage (Dial) 44 143 + * # 0x16, 0x00, 0x80, // Logical Minimum (-32768) 46 144 + * # 0x26, 0xff, 0x7f, // Logical Maximum (32767) 49 145 + * # 0x75, 0x10, // Report Size (16) 52 146 + * # 0x95, 0x01, // Report Count (1) 54 147 + * # 0x81, 0x06, // Input (Data,Var,Rel) 56 148 + * # 0x35, 0x00, // Physical Minimum (0) 58 149 + * # 0x46, 0x10, 0x0e, // Physical Maximum (3600) 60 150 + * # 0x15, 0x00, // Logical Minimum (0) 63 151 + * # 0x26, 0x10, 0x0e, // Logical Maximum (3600) 65 152 + * # 0x09, 0x48, // Usage (Resolution Multiplier) 68 153 + * # 0xb1, 0x02, // Feature (Data,Var,Abs) 70 154 + * # 0x45, 0x00, // Physical Maximum (0) 72 155 + * # 0xc0, // End Collection 74 156 + * # 0x75, 0x08, // Report Size (8) 75 157 + * # 0x95, 0x01, // Report Count (1) 77 158 + * # 0x81, 0x01, // Input (Cnst,Arr,Abs) 79 159 + * # 0x75, 0x08, // Report Size (8) 81 160 + * # 0x95, 0x01, // Report Count (1) 83 161 + * # 0x81, 0x01, // Input (Cnst,Arr,Abs) 85 162 + * # 0x75, 0x08, // Report Size (8) 87 163 + * # 0x95, 0x01, // Report Count (1) 89 164 + * # 0x81, 0x01, // Input (Cnst,Arr,Abs) 91 165 + * # 0x75, 0x08, // Report Size (8) 93 166 + * # 0x95, 0x01, // Report Count (1) 95 167 + * # 0x81, 0x01, // Input (Cnst,Arr,Abs) 97 168 + * # 0x75, 0x08, // Report Size (8) 99 169 + * # 0x95, 0x01, // Report Count (1) 101 170 + * # 0x81, 0x01, // Input (Cnst,Arr,Abs) 103 171 + * # 0xc0, // End Collection 105 172 + * # 0xc0, // End Collection 106 173 + * # 0xc0, // End Collection 107 174 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 108 175 + * # 0x09, 0x06, // Usage (Keyboard) 110 176 + * # 0xa1, 0x01, // Collection (Application) 112 177 + * # 0x85, 0x03, // Report ID (3) 114 178 + * # 0x05, 0x07, // Usage Page (Keyboard) 116 179 + * # 0x19, 0xe0, // Usage Minimum (224) 118 180 + * # 0x29, 0xe7, // Usage Maximum (231) 120 181 + * # 0x15, 0x00, // Logical Minimum (0) 122 182 + * # 0x25, 0x01, // Logical Maximum (1) 124 183 + * # 0x75, 0x01, // Report Size (1) 126 184 + * # 0x95, 0x08, // Report Count (8) 128 185 + * # 0x81, 0x02, // Input (Data,Var,Abs) 130 186 + * # 0x05, 0x07, // Usage Page (Keyboard) 132 187 + * # 0x19, 0x00, // Usage Minimum (0) 134 188 + * # 0x29, 0xff, // Usage Maximum (255) 136 189 + * # 0x26, 0xff, 0x00, // Logical Maximum (255) 138 190 + * # 0x75, 0x08, // Report Size (8) 141 191 + * # 0x95, 0x06, // Report Count (6) 143 192 + * # 0x81, 0x00, // Input (Data,Arr,Abs) 145 193 + * # 0xc0, // End Collection 147 194 + * R: 148 05 01 09 0e a1 01 85 11 05 0d 09 21 a1 02 15 00 25 01 75 01 95 01 a1 00 05 09 09 01 81 02 05 0d 09 33 81 02 95 06 81 03 a1 02 05 01 09 37 16 00 80 26 ff 7f 75 10 95 01 81 06 35 00 46 10 0e 15 00 26 10 0e 09 48 b1 02 45 00 c0 75 08 95 01 81 01 75 08 95 01 81 01 75 08 95 01 81 01 75 08 95 01 81 01 75 08 95 01 81 01 c0 c0 c0 05 01 09 06 a1 01 85 03 05 07 19 e0 29 e7 15 00 25 01 75 01 95 08 81 02 05 07 19 00 29 ff 26 ff 00 75 08 95 06 81 00 c0 195 + */ 196 + 197 + #define PAD_REPORT_DESCRIPTOR_LENGTH 148 198 + #define PEN_REPORT_DESCRIPTOR_LENGTH 93 199 + #define VENDOR_REPORT_DESCRIPTOR_LENGTH 18 200 + #define PAD_REPORT_ID 3 201 + #define DIAL_REPORT_ID 17 202 + #define PEN_REPORT_ID 10 203 + #define VENDOR_REPORT_ID 8 204 + #define PAD_REPORT_LENGTH 9 205 + #define PEN_REPORT_LENGTH 10 206 + #define VENDOR_REPORT_LENGTH 12 207 + 208 + 209 + __u8 last_button_state; 210 + 211 + static const __u8 fixed_rdesc_pad[] = { 212 + UsagePage_GenericDesktop 213 + Usage_GD_Keypad 214 + CollectionApplication( 215 + // -- Byte 0 in report 216 + ReportId(PAD_REPORT_ID) 217 + LogicalRange_i8(0, 1) 218 + UsagePage_Digitizers 219 + Usage_Dig_TabletFunctionKeys 220 + CollectionPhysical( 221 + // Byte 1 in report - just exists so we get to be a tablet pad 222 + Usage_Dig_BarrelSwitch // BTN_STYLUS 223 + ReportCount(1) 224 + ReportSize(1) 225 + Input(Var|Abs) 226 + ReportCount(7) // padding 227 + Input(Const) 228 + // Bytes 2/3 in report - just exists so we get to be a tablet pad 229 + UsagePage_GenericDesktop 230 + Usage_GD_X 231 + Usage_GD_Y 232 + ReportCount(2) 233 + ReportSize(8) 234 + Input(Var|Abs) 235 + // Byte 4 in report is the dial 236 + Usage_GD_Wheel 237 + LogicalRange_i8(-1, 1) 238 + ReportCount(1) 239 + ReportSize(8) 240 + Input(Var|Rel) 241 + // Byte 5 is the button state 242 + UsagePage_Button 243 + UsageRange_i8(0x01, 0x8) 244 + LogicalRange_i8(0x0, 0x1) 245 + ReportCount(7) 246 + ReportSize(1) 247 + Input(Var|Abs) 248 + ReportCount(1) // padding 249 + Input(Const) 250 + ) 251 + // Make sure we match our original report length 252 + FixedSizeVendorReport(PAD_REPORT_LENGTH) 253 + ) 254 + }; 255 + 256 + static const __u8 fixed_rdesc_pen[] = { 257 + UsagePage_Digitizers 258 + Usage_Dig_Pen 259 + CollectionApplication( 260 + // -- Byte 0 in report 261 + ReportId(PEN_REPORT_ID) 262 + Usage_Dig_Pen 263 + CollectionPhysical( 264 + // -- Byte 1 in report 265 + Usage_Dig_TipSwitch 266 + Usage_Dig_BarrelSwitch 267 + Usage_Dig_SecondaryBarrelSwitch // maps eraser to BTN_STYLUS2 268 + LogicalRange_i8(0, 1) 269 + ReportSize(1) 270 + ReportCount(3) 271 + Input(Var|Abs) 272 + ReportCount(4) // Padding 273 + Input(Const) 274 + Usage_Dig_InRange 275 + ReportCount(1) 276 + Input(Var|Abs) 277 + ReportSize(16) 278 + ReportCount(1) 279 + PushPop( 280 + UsagePage_GenericDesktop 281 + Unit(cm) 282 + UnitExponent(-1) 283 + PhysicalRange_i16(0, 266) 284 + LogicalRange_i16(0, 32767) 285 + Usage_GD_X 286 + Input(Var|Abs) // Bytes 2+3 287 + PhysicalRange_i16(0, 166) 288 + LogicalRange_i16(0, 32767) 289 + Usage_GD_Y 290 + Input(Var|Abs) // Bytes 4+5 291 + ) 292 + UsagePage_Digitizers 293 + Usage_Dig_TipPressure 294 + LogicalRange_i16(0, 8191) 295 + Input(Var|Abs) // Byte 6+7 296 + ReportSize(8) 297 + ReportCount(2) 298 + LogicalRange_i8(-60, 60) 299 + Usage_Dig_XTilt 300 + Usage_Dig_YTilt 301 + Input(Var|Abs) // Byte 8+9 302 + ) 303 + ) 304 + }; 305 + 306 + static const __u8 fixed_rdesc_vendor[] = { 307 + UsagePage_Digitizers 308 + Usage_Dig_Pen 309 + CollectionApplication( 310 + // Byte 0 311 + // We leave the pen on the vendor report ID 312 + ReportId(VENDOR_REPORT_ID) 313 + Usage_Dig_Pen 314 + CollectionPhysical( 315 + // Byte 1 are the buttons 316 + LogicalRange_i8(0, 1) 317 + ReportSize(1) 318 + Usage_Dig_TipSwitch 319 + Usage_Dig_BarrelSwitch 320 + Usage_Dig_SecondaryBarrelSwitch 321 + ReportCount(3) 322 + Input(Var|Abs) 323 + ReportCount(4) // Padding 324 + Input(Const) 325 + Usage_Dig_InRange 326 + ReportCount(1) 327 + Input(Var|Abs) 328 + ReportSize(16) 329 + ReportCount(1) 330 + PushPop( 331 + UsagePage_GenericDesktop 332 + Unit(cm) 333 + UnitExponent(-1) 334 + // Note: reported logical range differs 335 + // from the pen report ID for x and y 336 + LogicalRange_i16(0, 53340) 337 + PhysicalRange_i16(0, 266) 338 + // Bytes 2/3 in report 339 + Usage_GD_X 340 + Input(Var|Abs) 341 + LogicalRange_i16(0, 33340) 342 + PhysicalRange_i16(0, 166) 343 + // Bytes 4/5 in report 344 + Usage_GD_Y 345 + Input(Var|Abs) 346 + ) 347 + // Bytes 6/7 in report 348 + LogicalRange_i16(0, 8191) 349 + Usage_Dig_TipPressure 350 + Input(Var|Abs) 351 + // Bytes 8/9 in report 352 + ReportCount(1) // Padding 353 + Input(Const) 354 + LogicalRange_i8(-60, 60) 355 + // Byte 10 in report 356 + Usage_Dig_XTilt 357 + // Byte 11 in report 358 + Usage_Dig_YTilt 359 + ReportSize(8) 360 + ReportCount(2) 361 + Input(Var|Abs) 362 + ) 363 + ) 364 + UsagePage_GenericDesktop 365 + Usage_GD_Keypad 366 + CollectionApplication( 367 + // Byte 0 368 + ReportId(PAD_REPORT_ID) 369 + LogicalRange_i8(0, 1) 370 + UsagePage_Digitizers 371 + Usage_Dig_TabletFunctionKeys 372 + CollectionPhysical( 373 + // Byte 1 are the buttons 374 + Usage_Dig_BarrelSwitch // BTN_STYLUS, needed so we get to be a tablet pad 375 + ReportCount(1) 376 + ReportSize(1) 377 + Input(Var|Abs) 378 + ReportCount(7) // Padding 379 + Input(Const) 380 + // Bytes 2/3 - x/y just exist so we get to be a tablet pad 381 + UsagePage_GenericDesktop 382 + Usage_GD_X 383 + Usage_GD_Y 384 + ReportCount(2) 385 + ReportSize(8) 386 + Input(Var|Abs) 387 + // Byte 4 is the button state 388 + UsagePage_Button 389 + UsageRange_i8(0x01, 0x8) 390 + LogicalRange_i8(0x0, 0x1) 391 + ReportCount(8) 392 + ReportSize(1) 393 + Input(Var|Abs) 394 + // Byte 5 is the top dial 395 + UsagePage_GenericDesktop 396 + Usage_GD_Wheel 397 + LogicalRange_i8(-1, 1) 398 + ReportCount(1) 399 + ReportSize(8) 400 + Input(Var|Rel) 401 + // Byte 6 is the bottom dial 402 + UsagePage_Consumer 403 + Usage_Con_ACPan 404 + Input(Var|Rel) 405 + ) 406 + // Make sure we match our original report length 407 + FixedSizeVendorReport(VENDOR_REPORT_LENGTH) 408 + ) 409 + }; 410 + 411 + static const __u8 disabled_rdesc_pen[] = { 412 + FixedSizeVendorReport(PEN_REPORT_LENGTH) 413 + }; 414 + 415 + static const __u8 disabled_rdesc_pad[] = { 416 + FixedSizeVendorReport(PAD_REPORT_LENGTH) 417 + }; 418 + 419 + SEC(HID_BPF_RDESC_FIXUP) 420 + int BPF_PROG(dial_2_fix_rdesc, struct hid_bpf_ctx *hctx) 421 + { 422 + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, HID_MAX_DESCRIPTOR_SIZE /* size */); 423 + __s32 rdesc_size = hctx->size; 424 + __u8 have_fw_id; 425 + 426 + if (!data) 427 + return 0; /* EPERM check */ 428 + 429 + /* If we have a firmware ID and it matches our expected prefix, we 430 + * disable the default pad/pen nodes. They won't send events 431 + * but cause duplicate devices. 432 + */ 433 + have_fw_id = __builtin_memcmp(UDEV_PROP_HUION_FIRMWARE_ID, 434 + EXPECTED_FIRMWARE_ID, 435 + sizeof(EXPECTED_FIRMWARE_ID) - 1) == 0; 436 + if (rdesc_size == PAD_REPORT_DESCRIPTOR_LENGTH) { 437 + if (have_fw_id) { 438 + __builtin_memcpy(data, disabled_rdesc_pad, sizeof(disabled_rdesc_pad)); 439 + return sizeof(disabled_rdesc_pad); 440 + } 441 + 442 + __builtin_memcpy(data, fixed_rdesc_pad, sizeof(fixed_rdesc_pad)); 443 + return sizeof(fixed_rdesc_pad); 444 + } 445 + if (rdesc_size == PEN_REPORT_DESCRIPTOR_LENGTH) { 446 + if (have_fw_id) { 447 + __builtin_memcpy(data, disabled_rdesc_pen, sizeof(disabled_rdesc_pen)); 448 + return sizeof(disabled_rdesc_pen); 449 + } 450 + 451 + __builtin_memcpy(data, fixed_rdesc_pen, sizeof(fixed_rdesc_pen)); 452 + return sizeof(fixed_rdesc_pen); 453 + } 454 + /* Always fix the vendor mode so the tablet will work even if nothing sets 455 + * the udev property (e.g. huion-switcher run manually) 456 + */ 457 + if (rdesc_size == VENDOR_REPORT_DESCRIPTOR_LENGTH) { 458 + __builtin_memcpy(data, fixed_rdesc_vendor, sizeof(fixed_rdesc_vendor)); 459 + return sizeof(fixed_rdesc_vendor); 460 + 461 + } 462 + return 0; 463 + } 464 + 465 + SEC(HID_BPF_DEVICE_EVENT) 466 + int BPF_PROG(dial_2_fix_events, struct hid_bpf_ctx *hctx) 467 + { 468 + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 16 /* size */); 469 + static __u8 button; 470 + 471 + if (!data) 472 + return 0; /* EPERM check */ 473 + 474 + /* Only sent if tablet is in default mode */ 475 + if (data[0] == PAD_REPORT_ID) { 476 + /* Nicely enough, this device only supports one button down at a time so 477 + * the reports are easy to match. Buttons numbered from the top 478 + * Button released: 03 00 00 00 00 00 00 00 479 + * Button 1: 03 00 05 00 00 00 00 00 -> b 480 + * Button 2: 03 00 08 00 00 00 00 00 -> e 481 + * Button 3: 03 00 0c 00 00 00 00 00 -> i 482 + * Button 4: 03 00 e0 16 00 00 00 00 -> Ctrl S 483 + * Button 5: 03 00 2c 00 00 00 00 00 -> space 484 + * Button 6: 03 00 e0 e2 1d 00 00 00 -> Ctrl Alt Z 485 + */ 486 + button &= 0xc0; 487 + 488 + switch ((data[2] << 16) | (data[3] << 8) | data[4]) { 489 + case 0x000000: 490 + break; 491 + case 0x050000: 492 + button |= BIT(0); 493 + break; 494 + case 0x080000: 495 + button |= BIT(1); 496 + break; 497 + case 0x0c0000: 498 + button |= BIT(2); 499 + break; 500 + case 0xe01600: 501 + button |= BIT(3); 502 + break; 503 + case 0x2c0000: 504 + button |= BIT(4); 505 + break; 506 + case 0xe0e21d: 507 + button |= BIT(5); 508 + break; 509 + } 510 + 511 + __u8 report[8] = {PAD_REPORT_ID, 0x0, 0x0, 0x0, 0x00, button}; 512 + 513 + __builtin_memcpy(data, report, sizeof(report)); 514 + return sizeof(report); 515 + } 516 + 517 + /* Only sent if tablet is in default mode */ 518 + if (data[0] == DIAL_REPORT_ID) { 519 + /* 520 + * In default mode, both dials are merged together: 521 + * 522 + * Dial down: 11 00 ff ff 00 00 00 00 00 -> Dial -1 523 + * Dial up: 11 00 01 00 00 00 00 00 00 -> Dial 1 524 + */ 525 + __u16 dial = data[3] << 8 | data[2]; 526 + 527 + button &= 0x3f; 528 + button |= !!data[1] << 6; 529 + 530 + __u8 report[] = {PAD_REPORT_ID, 0x0, 0x0, 0x0, dial, button}; 531 + 532 + __builtin_memcpy(data, report, sizeof(report)); 533 + return sizeof(report); 534 + } 535 + 536 + /* Nothing to do for the PEN_REPORT_ID, it's already mapped */ 537 + 538 + /* Only sent if tablet is in raw mode */ 539 + if (data[0] == VENDOR_REPORT_ID) { 540 + /* Pad reports */ 541 + if (data[1] & 0x20) { 542 + /* See fixed_rdesc_pad */ 543 + struct pad_report { 544 + __u8 report_id; 545 + __u8 btn_stylus; 546 + __u8 x; 547 + __u8 y; 548 + __u8 buttons; 549 + __u8 dial_1; 550 + __u8 dial_2; 551 + } __attribute__((packed)) *pad_report; 552 + __u8 dial_1 = 0, dial_2 = 0; 553 + 554 + /* Dial report */ 555 + if (data[1] == 0xf1) { 556 + __u8 d = 0; 557 + 558 + if (data[5] == 2) 559 + d = 0xff; 560 + else 561 + d = data[5]; 562 + 563 + if (data[3] == 1) 564 + dial_1 = d; 565 + else 566 + dial_2 = d; 567 + } else { 568 + /* data[4] are the buttons, mapped correctly */ 569 + last_button_state = data[4]; 570 + dial_1 = 0; // dial 571 + dial_2 = 0; 572 + } 573 + 574 + pad_report = (struct pad_report *)data; 575 + 576 + pad_report->report_id = PAD_REPORT_ID; 577 + pad_report->btn_stylus = 0; 578 + pad_report->x = 0; 579 + pad_report->y = 0; 580 + pad_report->buttons = last_button_state; 581 + pad_report->dial_1 = dial_1; 582 + pad_report->dial_2 = dial_2; 583 + 584 + return sizeof(struct pad_report); 585 + } 586 + 587 + /* Pen reports need nothing done */ 588 + } 589 + 590 + return 0; 591 + } 592 + 593 + HID_BPF_OPS(inspiroy_dial2) = { 594 + .hid_device_event = (void *)dial_2_fix_events, 595 + .hid_rdesc_fixup = (void *)dial_2_fix_rdesc, 596 + }; 597 + 598 + SEC("syscall") 599 + int probe(struct hid_bpf_probe_args *ctx) 600 + { 601 + switch (ctx->rdesc_size) { 602 + case PAD_REPORT_DESCRIPTOR_LENGTH: 603 + case PEN_REPORT_DESCRIPTOR_LENGTH: 604 + case VENDOR_REPORT_DESCRIPTOR_LENGTH: 605 + ctx->retval = 0; 606 + break; 607 + default: 608 + ctx->retval = -EINVAL; 609 + } 610 + 611 + return 0; 612 + } 613 + 614 + char _license[] SEC("license") = "GPL";
+1
drivers/hid/bpf/progs/hid_bpf.h
··· 9 9 #define HID_BPF_RDESC_FIXUP "struct_ops/hid_rdesc_fixup" 10 10 #define HID_BPF_OPS(name) SEC(".struct_ops.link") \ 11 11 struct hid_bpf_ops name 12 + #define hid_set_name(_hdev, _name) __builtin_memcpy(_hdev->name, _name, sizeof(_name)) 12 13 13 14 struct hid_bpf_probe_args { 14 15 unsigned int hid;